-90.67% is the change from 847 to 79
Calculation steps:
[( 79 - 847 ) ÷ 847] x 100 = -90.67%
Formula
Percentage change = [(79 - 847) / 847] x 100
Subtract the new number by the original number
79 - 847 = -768
-768 ÷ 847 = -0.9067296340023613
-0.9067296340023613 x 100 = -90.67%